Bio plastics or biodegradable plastics are by chemical nature polyhydroxy alkanoates or PHAs. They are currently being produced in large amount by microbial fermentation process in industries. Among all the polyhydroxy alkanoates, polyhydroxy butyrate or PHB is the most important one as bio plastics. Biodegradable plastics can be composed of bio-plastics, which are plastics made from renewable raw materials. There are normally two forms of biodegradable plastic, injection molded and solid. The solid forms normally are used for items such as food containers, leaf collection bags, and water bottles. Bioplastics can also be processed in very similar ways to petrochemical plastics such as injection moulding, extrusion and thermoforming. To improve their tensile strength, bioplastic polymers can be blended with their co-polymers or with other polymers.
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